Here are some costars who took their undeniable chemistry off-screen and are still going strong.

Their onscreen friendship was more of a brotherhood, rather than a relationship between best friends.

The duo is still going strong!

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The highlight of this friendship has to be when the two took the stage together.

They recreated “Give It Up” during Grande’sSweetenertour and the crowd was left speechless.

(We don’t need to relive the Kelly-Brenda-Dylan drama.)

However, that didn’t stop Garth from gaining a life-long friendship.

Without this friendship, we may not have ever gotten the short-livedBeverly Hills, 90210reboot.

However, it turns out that off-screen he won the real heart of James Lafferty.

Not only are the two still friends but they are also co-collaborators.

The duo’s latest project, the seriesEveryone Is Doing Great,is currently streaming on Hulu.

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By the end ofThe OriginalsHayley and Rebekah were more like family than anything.

The development of that relationship came naturally due to Holt and Tonkin’s chemistry that was simply unmatched.

Even though their friendship was made in their early teens, they’re still going strong.

The duo even goes on vacations together.

Nelson and Wells attribute their mutual hatred for their show wigsas their bonding moment on set.

For these two, forming a connection through hate led to a decade long friendship.

Read more fromI Want My Teen TV, EW’s summerlong celebration of teen shows past and present.